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reduce speed light


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jw5500
Novice

Dec 9, 2012, 9:17 AM

Post #1 of 13 (2589 views)
reduce speed light Sign In

on my 2003 chevrolet trailblazer when driving my reduce speed light comes on what is the problem and how can i fix


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Dec 9, 2012, 9:22 AM

Post #2 of 13 (2585 views)
Re: reduce speed light Sign In

Do you mean reduce engine power light?

Which engine? Have the engine computer scanned for trouble codes. Write down the numbers.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Dec 9, 2012, 9:24 AM)


jw5500
Novice

Dec 9, 2012, 9:32 AM

Post #3 of 13 (2573 views)
Re: reduce speed light Sign In

yes reduce engine power light


MarineGrunt
Enthusiast
MarineGrunt profile image

Dec 9, 2012, 9:38 AM

Post #4 of 13 (2570 views)
Re: reduce speed light Sign In

It could be as simple as a gummed up throttle body, but like DS said, get it scanned for codes and post them here. DS or the other mechanics will be able to point you in the right direction. You can go to your local auto parts store such as Advanced or Auto Zone and they will scan it for free.


jw5500
Novice

Dec 9, 2012, 9:43 AM

Post #5 of 13 (2563 views)
Re: reduce speed light Sign In

ok i will scann it i have replaced the throttel body but still have this problem


jw5500
Novice

Dec 9, 2012, 4:44 PM

Post #6 of 13 (2513 views)
Re: reduce speed light Sign In

thanks guysi replaced the map sencer and trottel body and still have problem the codes are[p0014] [p1271] and[p0237]


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 9, 2012, 4:46 PM

Post #7 of 13 (2509 views)
Re: reduce speed light Sign In

How about an engine size?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Dec 9, 2012, 4:54 PM

Post #8 of 13 (2506 views)
Re: reduce speed light Sign In

4.2L. 5.3L won't set a cam phaser code.

You sure that P0237 is the code you got. Doesn't appear to be a valid code.

The reduced engine power is being caused by the APP code P1271. The engine controller is seeing that the pedal position sensors don't agree. A glitch in either one of those pedal sensor inputs can cause the PCM to reduce engine power. The fun part is finding the problem. If it is a glitch, a volt meter or even a scan tool in graph mode won't catch it if it last for a few milliseconds. This is when you whip out the scope and do sweep tests. Inspect the pedal position sensor harness at the gas pedal. Make sure the connector terminals are clean and the terminal tension is good. Some of those APP codes can be a real nightmare to solve.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Dec 9, 2012, 5:15 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 9, 2012, 5:02 PM

Post #9 of 13 (2497 views)
Re: reduce speed light Sign In

OK, the PO14 is a cam Phaser code as DS pointed out. This could be very complicated or as simple as being overdue for an oil change or low on oil but that code isn't the one you are referring to. The P1271 is a code for the Pedal Position sensor which is the other half of the throttle system. It's basically your gas pedal. There are some complicated tests to run to find the issue but the sensor itself is highly likely to be the problem.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jw5500
Novice

Dec 9, 2012, 5:15 PM

Post #10 of 13 (2488 views)
Re: reduce speed light Sign In

where is this pps pedal position sensor located in the trailblazer


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 9, 2012, 5:18 PM

Post #11 of 13 (2483 views)
Re: reduce speed light Sign In

As I already said. It's your gas pedal.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Dec 9, 2012, 5:21 PM

Post #12 of 13 (2479 views)
Re: reduce speed light Sign In







Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Dec 9, 2012, 5:23 PM)


jw5500
Novice

Dec 9, 2012, 5:49 PM

Post #13 of 13 (2467 views)
Re: reduce speed light Sign In

thanks






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